Electromagnetic sounding device



Oct. 12 1926.

A. DIEMER ET AL ELECTROMAGNETIC SOUNDING DEVICE Filed Sept. 26 1925 I Patented Oct. 12, 1926.

g 1,603,073. .UNITED T T-as PATENT vOF FICE.'

ANTON n mmnn, or sru'rrcnar, am) 'nnivs'r nuns'r, or cniws'rnr'r, GERMANY, As- SIGNORS 'ro nonnar BOSCH nx'rrnnensnmscnnrr, or sru'rrcnnr, GERMANY.

mnc'rnomnennrrc SOUNDING nnvrcn Application filed September 26, 19 25, Serial No. 58,873, and in Germany November 28, 1928.

In the buzzer sounding devices an arma- .ture, which cooperates with one or more sound-disks,-is caused to vibrate-by means of electromagnetic action.

In the known soundin devices of this kind the armature is rigi lyconnected to a spindle, which spindle is guided at two points, for instance, at a sound disk and edge or corner on the poles and that the entire attractive force of the buzzer magnet then tends to tilt the armature around the resting point as a pivot; the consequence of "this being that the guiding device of the armature is jammed and twisted. It is always desirable that the armature shall not begin to rest on the magnet with one edge only but that contactbetween all parts of the cooperating surfaces of-the magnet and armature shall be made simultaneously and with a decided impact.

According to the present invention the before-mentioned drawback is obviated by connecting the armature with its guide in such a manner as to be movable in all directions, so that said armature can adjust itself automatically parallel to the pole surface. This universal -adjustability is effected by providing ball-cups on the armature and its guide, sald parts being temporarily or constantly pressed against each other with only such a-pressure' that unbalanced impacts between the armature and magnet caused by the unsymmetric'setting of the armature will effect an automatic adjustment of the armature.

In the accompanying drawing one form of construction of the subject-matter of I our invention is illustrated by way of example in cross-section.

The plate-shaped armature 1 of a buzzer horn .is guided approximately vertically to the pole-surfaces of the buzzer electromagnet 2 by reason of.the,spindle 3, carrying said armature, being secured to the soundplate 4 of the buzzer-horn and to a platespring 5, and by reason of the ball and socket joint connections hereinafter v The armature 1 is supported by the spin-' dle 3 and held thereby, since it is pressed against the upper end- .of said spindle by means of a screw 6, passing through the en tire length of the spindle and a nut 7, rivete'd into the plate-spring 5. In order to insure avertical setting of the armature 1 on the magnet 2, the armature constructed accordlng to this invention is provided with a esf ball-cup 9, which rests -on the ball-shaped'-- end of the spindle 3. Furthermore a metal plate 8 having a 'semi'spherelike projection is inserted into the armature, the ball cup of the armature 1 and thesphere of the metal plate having the same centre. The semispherelike extension of the metal plate 8 engages with the correspondingly shaped lower face of the nut 7. An armature mounted in this manner adjusts itself auto- .matically parallel to the pole surface when at the assembling of the device the nut 7 is not fully screwed home but is tight enough so that the friction between the spherical parts is sufficient to hold the armature in the positions to which it may. be moved when it strikes the magnet during operation of the device. After a short trial operation, the armature ad usts itself correctly and this adjustment can be constantly maintained by tightening the nut. Another shorter method of adjustment '18 as follows: If at first the armature is tiltedor inclined with reference to the magnet-poles,

pole faces, and the device is ready for accurate operation. .The assembling of the buzzer hornis simplified and made more economical in this manner. I I We claim: 1. An electrg nagnetic sounding device comprising, in' f fiqmbination, an electromagnet, an armature adapted to be set in vibration by said electromagnet, means, including asound disk adapted to be set in vibration .by said armature, for supportingsaid armature for movement substantially perpendicularly to the plane of the pole'gfaces of said v the armature with the pole faces of'said elecv tromagnet for adjusting said armature par electromagnet, such supportin' means including means effective throng contact of allel to said pole faces.

2. An electromagnetic sounding device comprising, in combination,-an electromagnet, an armature adapted to beset in vibra-v tion by said electromagnet, means, inolud-- net wherebydzhe armature will be adjusted parallel to said pole faces through contact therewith. t 4 4 3. An electromagnetic sounding device, comprising in combination an electromag- -net, an armature set in vibration by said e ectromagnet, such supporting electromagnet, a sound disk set "in vibration by said armature, a spindle for said armature and a ball and socket joint connection between said spindle andsaid armature,-said connection allowing the armature to be adjusted parallel to the pole facesof said elecmature in adjusted position on said spindle.

tromagnet, and means for securing the ar- 4. An electromagnetic sounding device comprising, in combination, an electromagnet, an armature adapted to be set in viba'ationby said electromagnet, a support for said armature permitting the vibratory movement of said armature, a vibratory sound disk set in vibration by said arma-' ture, and means efi'ective through movement of said armature automatically adjusting said armature parallel to the pole faces of said electromagnet.

5. An electromagn set forth in claim 4 and having manually operated means for. securing the armature in its adjusted position in parallelism to the pole faces of said electromagnet;

In testimony whereof 'we have aflixed our signatures.- 1

ANTON DIEMEL. ERNST BURST.-

hereunto etic sounding device as 

